Questions and Answers
What is the phenomenon in which a changing magnetic field in a circuit induces an electromotive force (emf)?
Faraday's law of electromagnetic induction
What happens to the induced emf in a coil when the rate of change of magnetic flux through it increases?
It increases
In electromagnetic induction, Lenz's law states that the direction of the induced current in a circuit is such that it:
Opposes the change in magnetic flux producing it
Study Notes
Electromagnetic Induction
- The phenomenon in which a changing magnetic field in a circuit induces an electromotive force (emf) is called electromagnetic induction.
- Electromagnetic induction occurs when there is a change in magnetic flux through a circuit.
Induced EMF
- When the rate of change of magnetic flux through a coil increases, the induced emf in the coil also increases.
- The magnitude of the induced emf is directly proportional to the rate of change of magnetic flux.
Lenz's Law
- Lenz's law states that the direction of the induced current in a circuit is such that it opposes the change in magnetic flux that induces it.
- The induced current flows in a direction that generates a magnetic field that counteracts the original change in magnetic flux.
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